CN207619672U - A kind of vibration absorber and washing machine - Google Patents
A kind of vibration absorber and washing machine Download PDFInfo
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- CN207619672U CN207619672U CN201721456051.0U CN201721456051U CN207619672U CN 207619672 U CN207619672 U CN 207619672U CN 201721456051 U CN201721456051 U CN 201721456051U CN 207619672 U CN207619672 U CN 207619672U
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- vibration isolator
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Abstract
The utility model discloses a kind of vibration absorber and washing machine, which includes：First vibration isolator, raft body and the second vibration isolator；First vibration isolator and second vibration isolator, are respectively arranged at the both sides of the raft body；Wherein, one in first vibration isolator and second vibration isolator, including：Spring-damper；The spring-damper carries out passive type vibration damping processing for treating the vibration generated when dampening apparatus operation；Another in first vibration isolator and second vibration isolator, including：Electromagnetism vibration isolator；The electromagnetism vibration isolator, for carrying out active vibration damping processing to the vibration.The embodiment of the utility model can overcome in the prior art the defects of vibrating noise is big, junction is fragile and operational reliability is poor, and realization vibrating noise is small, junction is hardly damaged the advantageous effect good with operational reliability.
Description
Technical field
The utility model belongs to antivibration area, and in particular to a kind of vibration absorber and washing machine, more particularly to it is a kind of
Semi-active type damping base, the washing machine with the semi-active type damping base and the laundry based on the setting of buoyant raft principle
Oscillation damping method of the machine based on buoyant raft principle.
Background technology
With social development, life progress, washing machine has gradually come into every family, has started to facilitate people’s lives.
Washing machine can be acted on using electric energy production machinery to wash clothing.Washing machine its centrifugal intertia force in dehydration can be up to
20KN, huge inertia force are passed to by spring, the damper being connect with cartridge module on box assembly, and box assembly generation is made to shake
It is dynamic.Washing machine now, is generally placed directly in ground, and in washing machine during being used for a long time, vibrating noise is larger, passes through
Ground is transmitted and the contact on ground and washing machine lower margin rigidity, easily deforms foundation bolt junction, or even damage.
In the prior art, there are vibrating noises it is big, junction is fragile and operational reliability is poor the defects of.
Utility model content
The purpose of this utility model is that in view of the foregoing drawbacks, a kind of vibration absorber and washing machine are provided, it is existing to solve
Washing machine is placed directly in the big problem of vibrating noise on ground in technology, achievees the effect that reduce vibrating noise.
The utility model provides a kind of vibration absorber, including：First vibration isolator, raft body and the second vibration isolator；Described first
Vibration isolator and second vibration isolator, are respectively arranged at the both sides of the raft body；Wherein, first vibration isolator and described second
One in vibration isolator, including：Spring-damper；The spring-damper, for treat dampening apparatus operation when generate shake
It is dynamic to carry out passive type vibration damping processing；Another in first vibration isolator and second vibration isolator, including：Electromagnetism vibration isolation
Device；The electromagnetism vibration isolator, for carrying out active vibration damping processing to the vibration.
Optionally, wherein the quantity of first vibration isolator is more than one；And/or the quantity of second vibration isolator
For more than one；And/or when the vibration absorber is placed vertically, if the spring-damper is located at upper layer, the electricity
Magnetic vibration isolator is located at lower layer；If the spring-damper is located at lower layer, the electromagnetism vibration isolator is located at upper layer.
Optionally, further include；At least one of apparatus connecting unit and pedestal；Wherein, the apparatus connecting unit, is set to
Side of first vibration isolator far from the raft body, for the contact between first vibration isolator and the equipment to be damped
Or connection；The pedestal is set to side of second vibration isolator far from the raft body, is used for second vibration isolator and institute
State the contact or connection between the matrix in equipment local environment to be damped；Wherein, described matrix, including：In ground, wall
Any one.
Optionally, wherein the apparatus connecting unit, including：In integral type interconnecting piece, split type interconnecting piece at least it
One；When the apparatus connecting unit includes split type interconnecting piece, the quantity of the split type interconnecting piece and first vibration isolator
Quantity it is consistent；And/or the raft body, including：At least one of integral type raft body, split type raft body；When the raft body packet
When including split type raft body, the quantity of the split type raft body meets while first vibration isolator and second vibration isolation is arranged
Requirement when device；And/or the pedestal, including：At least one of integral type pedestal, Separated base；When the base
When seat includes Separated base, the quantity of the Separated base is consistent with the quantity of the second vibration isolator；And/or it is described
The thickness of at least one of apparatus connecting unit, first vibration isolator, the raft body, second vibration isolator, the pedestal or
Highly, it can be adjusted according to use demand.
Optionally, the electromagnetism vibration isolator, including：Push-plate and electromagnet；Wherein, one end of the push-plate is installed on institute
State raft body；The other end of the push-plate is placed in the field region that magnetic field force produced by the electromagnet is formed；Subtract when described
When vibrating device further includes pedestal, the electromagnet is installed on the pedestal, for generating the magnetic field force, in the push-plate
When with the vibration equipment to be damped, by the magnetic fields of the magnetic field force, avoid between the push-plate and the pedestal
Rigid contact.
Optionally, wherein the structure of the push-plate, including：First connector, intermediate connector and the second connector；Its
In, first connector is connected to the raft body；Second connector is placed in the field regions of the electromagnet
In domain；The intermediate connector is connected between first connector and second connector, and is connect with described first
Part and second connector form zigzag configuration；And/or the structure of the electromagnet, including：It is concave structure, half I-shaped
At least one of structure, arcuate structure, C-shaped configuration；And/or the direction of the magnetic field force of the electromagnet generation, perpendicular to institute
Plane where stating raft body.
Optionally, wherein in the zigzag configuration, first connector and second connector are arranged in parallel, institute
Intermediate connector is stated perpendicular to first connector and second connector to be arranged；And/or when second vibration isolator
When quantity including electromagnetism vibration isolator and second vibration isolator is identical as the quantity of foundation bolt of equipment to be damped,
Each second vibration isolator, is correspondingly arranged to the corresponding foundation bolt of the equipment to be damped, for the institute by the quantity
The synergistic effect for stating push-plate and the electromagnet described in the second vibration isolator waits subtracting in the vibration equipment to be damped to described
Equipment of shaking is limited.
Optionally, further include：Displacement sensor and controller；Wherein, institute's displacement sensors, for obtaining the electromagnetism
The vibration displacement of vibration isolator；The controller, in the case where the vibration displacement is greater than or equal to setting displacement, turning down
The input current of the electromagnetism vibration isolator；In the case where the vibration displacement is less than the setting displacement, the electromagnetism is tuned up
The input current of vibration isolator.
Optionally, wherein further include：Comparator；The comparator, for the vibration displacement and the setting displacement
It is compared, with the magnitude relationship of the determination vibration displacement and the setting displacement；And/or when the electromagnetism vibration isolator packet
When including push-plate and electromagnet, institute's displacement sensors are distributed on the push-plate；The input current of the electromagnetism vibration isolator is
Input to the electromagnet and be used to generate the electric current of electromagnetic force；And/or when the electromagnetism vibration isolator quantity be one with
When upper, the quantity of institute's displacement sensors is consistent with the quantity of electromagnetism vibration isolator；Wherein, each institute's displacement sensors,
Each vibration displacement for obtaining each electromagnetism vibration isolator；Input current of the controller to the electromagnetism vibration isolator
Control, including：According to each vibration displacement, the corresponding input current of each electromagnetism vibration isolator is individually controlled
System.
Matching with above-mentioned vibration absorber, on the other hand the utility model provides a kind of washing machine, including：It is above-described
Vibration absorber；The vibration absorber is installed on the bottom of the washing machine, the pedestal as the washing machine；Wherein, when described
When the quantity of second vibration isolator is four, four second vibration isolators, four foundation bolts pair with the washing machine bottom
It should be arranged.
The embodiment of the utility model, by making pedestal use buoyant raft vibration isolation way, it is possible to reduce during use earthward
The noise generated when the vibration and operation of transmission generates so as to be effectively reduced when the transmission and operation of vibration earthward
Noise.
Further, the embodiment of the utility model can reduce the ground that rigid contact is brought by the effect in magnetic field in pedestal
Foot damages, and such as reduces traditional ground and is damaged with the lower margin that lower margin rigid contact is brought.
Further, the embodiment of the utility model carries out buoyant raft vibration isolation by using pedestal, can reduce vibration, reduces ground
Foot damages, and can also reduce the probability of " walking about " phenomenon generation, and it is common because horizontal vibration power is more than lower margin such as to reduce washing machine
Frictional force and generate " walking about " phenomenon generation probability.
Further, the embodiment of the utility model, by the height of increase washing machine, clothing of conveniently taking, while can be the bottom of at
It is placed in seat and commonly uses washing implement, improve the convenience that life uses.
The embodiment of the utility model as a result, by the pedestal being arranged based on buoyant raft vibration isolation principle, carry out spring-damper and
Electromagnetism vibration isolator realizes active and passive type vibration damping in combination, solves washing machine in the prior art and be placed directly on ground to shake
The big problem of dynamic noise, to overcome in the prior art that vibrating noise is big, junction is fragile and what operational reliability was poor lacks
It falls into, realization vibrating noise is small, junction is hardly damaged the advantageous effect good with operational reliability.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood by implementing the utility model.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Description of the drawings
Fig. 1 is the structural schematic diagram of buoyant raft shock-resistant system mechanical model；
Fig. 2 is the assembling structure schematic diagram of the utility model in the base (i.e. vibration absorber) and an embodiment of washing machine；
Fig. 3 is the mechanical model schematic diagram of an embodiment of the pedestal (i.e. vibration absorber) of the utility model；
Fig. 4 shows for the operation principle of an embodiment of electromagnetism vibrating isolation system in the pedestal (i.e. vibration absorber) of the utility model
It is intended to.
In conjunction with attached drawing 1, reference numeral is as follows in the utility model embodiment：
11- top apparatus interconnecting pieces；The upper layers 12- vibration isolator；Raft body among 13-；14- lower layers vibration isolator；The bottoms 15- base
Seat.
In conjunction with attached drawing 2 and attached drawing 3, reference numeral is as follows in the utility model embodiment：
1- washing machines；2- pedestals；21- apparatus connecting unit；The first vibration isolators of 22-；221- spring-dampers；23- raft bodies
(such as：Buoyant raft, raft body tablet etc.)；The second vibration isolators of 24- (such as：Electromagnetism vibration isolator)；241- push-plates；242- electromagnet (examples
Such as：Spill electromagnet)；25- pedestals；26- controllers；27- displacement sensors；28- comparators.
Specific implementation mode
It is specific below in conjunction with the utility model to keep the purpose of this utility model, technical solution and advantage clearer
Technical solutions of the utility model are clearly and completely described in embodiment and corresponding attached drawing.Obviously, described embodiment
Only it is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, this field
The every other embodiment that those of ordinary skill is obtained without making creative work, belongs to the utility model
The range of protection.
Usually, washing machine is bolted in every family in use, common mode is directly to place by rigidity
Lower margin be supported on ground, such connection type, vibration isolating effect is bad, and noise is larger, and during being used for a long time, ground
Foot easy damaged and cause usage experience drastically to decline, present roller washing machine insufficient height in addition often needs in use
It bends over clothing of taking, convenience is inadequate.Such as：For roller washing machine, insufficient height and can only bend over to put clothing and take clothing, not enough just
Just.
Embodiment according to the present utility model provides a kind of vibration absorber, the device of the utility model as shown in Figure 3
The structural schematic diagram of one embodiment.The vibration absorber may include：First vibration isolator 22, raft body 23 and the second vibration isolator 24；Institute
The first vibration isolator 22 and second vibration isolator 24 are stated, the both sides of the raft body 23 are respectively arranged at.
Wherein, one in first vibration isolator 22 and second vibration isolator 24 may include：Spring-damper
221；The spring-damper 221 can be used for treating the vibration generated when dampening apparatus operation and carry out passive type vibration damping processing.
Another in first vibration isolator 22 and second vibration isolator 24 may include：Electromagnetism vibration isolator；The electromagnetism vibration isolation
Device can be used for carrying out active vibration damping processing to the vibration.
Such as：Based on the principle of buoyant raft vibration isolation, there is good effectiveness in vibration suppression under each vibration frequency and rigidity, simultaneously
Using passively arranging in pairs or groups in a buoyant raft vibration insulating system with active damping mode, with being adapted to washing machine strength of one's legs differ and
Vibration Condition under different rotating speeds reaches good effect of vibration and noise reduction.
Such as：By passively with active vibration damping arrange in pairs or groups in a semi-active type buoyant raft vibration insulating system (such as：By passive
Formula vibration-proof structure and active vibration damping structure matching form a semi-active type buoyant raft vibration insulating system) in, it can be in different frequency
There is good vibration isolation and damping effect under vibration, adapts to Vibration Condition of the washing machine under different rotating speeds, reach good vibration damping
Noise reduction.
Such as：Pedestal (i.e. vibration absorber) uses buoyant raft vibration isolation way, it is possible to reduce is earthward transmitted during use
The noise that generates when vibration and operation, so as to be effectively reduced making an uproar of being generated when the transmission and operation of vibration earthward
Sound.
Passive type and active vibration damping in combination are carried out by spring-damper and electromagnetism vibration isolator as a result, are adapted to
The ground strength of one's legs of equipment to be damped differ and different rotating speeds etc. it is a variety of in the case of Vibration Condition, reach good vibration and noise reducing
Effect, and reliability is high, the comfort and convenience that user uses are good.
In an optional example, the raft body 23 may include：In integral type raft body, split type raft body at least it
One.When the raft body 23 may include split type raft body, the quantity of the split type raft body meets while being arranged described first
Requirement when vibration isolator 22 and second vibration isolator 24.
As a result, by the raft body of diversified forms, the first vibration isolator of different number and setting for the second vibration isolator can be facilitated
It sets and is distributed, be conducive to the flexibility and the diversity that promote the first vibration isolator and the second vibration isolator layout, and then can be adapted for
A variety of equipment to be damped and a variety of use occasions, it is versatile.
In an optional example, the electromagnetism vibration isolator may include：Push-plate 241 and electromagnet 242.
Such as：Electromagnetism vibration isolation form, may be used push-plate (such as：Push-plate 241) and electromagnet (such as：Electromagnet 242)
It realizes.
In an optional specific example, one end of the push-plate 241 is installed on the raft body 23.The push-plate 241
The other end is placed in the field region that magnetic field force produced by the electromagnet 242 is formed.
In an optional specific example, when the vibration absorber can also include pedestal 25, the electromagnet 242,
Be installed on the pedestal 25, can be used for generating the magnetic field force, in the push-plate 241 with the vibration equipment to be damped
When, by the magnetic fields of the magnetic field force, avoid the rigid contact between the push-plate 241 and the pedestal 25.
Such as：Push-plate (such as：Push-plate 241) and raft body tablet (such as：Raft body 23) it is affixed, it is placed in " recessed " shape electromagnet
In the field region of generation, the magnetic field force of generation is vertical direction, " recessed " shape electromagnet and pedestal (such as：Pedestal 25) it is affixed.
Such as：It can reduce rigidity instead of the rigid contact on traditional ground and lower margin by the effect in magnetic field in pedestal
The lower margin damage brought is contacted, such as reduces traditional ground and is damaged with the lower margin that lower margin rigid contact is brought.
Being equipped with by push-plate and electromagnet as a result, may be implemented electromagnetism vibration isolation, simple in structure, control mode letter
Just, and reliability is high.
Optionally, the structure of the push-plate 241 may include：First connector, intermediate connector and the second connector.
Wherein, first connector is connected to the raft body 23.Second connector, is placed in the electromagnet
In 242 field region.The intermediate connector is connected between first connector and second connector,
And form zigzag configuration with first connector and second connector.
Z-shaped knot by the way that push-plate to be arranged to be formed by the first connector, intermediate connector and the second connector as a result,
Structure facilitates the connection of push-plate and raft body and pedestal, property easy to use good；Push-plate is also convenient for realize by the magneticaction of electromagnet
Active vibration damping, vibration damping reliability are high.
More optionally, in the zigzag configuration, first connector and second connector are arranged in parallel, described
Intermediate connector is arranged perpendicular to first connector and second connector.
As a result, by making intermediate connector perpendicular to the first connector and the second connector in zigzag configuration, control is convenient
More preferably, effectiveness in vibration suppression is more preferably.
Optionally, the structure of the electromagnet 242 may include：Concave structure (such as：Spill electromagnet), half I-shaped
At least one of shape structure, arcuate structure, C-shaped configuration.
As a result, by the electromagnet of diversified forms, the flexibility and convenience that electromagnet uses can be promoted.
Optionally, the direction for the magnetic field force that the electromagnet 242 generates, perpendicular to 23 place plane of the raft body.
As a result, by making electromagnet generate the magnetic field force perpendicular to plane where raft body, can be better achieved active
Effectiveness in vibration suppression, and the input current needed for electromagnet is small, good energy-conserving effect.
Optionally, when second vibration isolator 24 may include the quantity of electromagnetism vibration isolator and second vibration isolator 24
When identical as the quantity of foundation bolt of equipment to be damped, each second vibration isolator 24, with the equipment to be damped
Corresponding foundation bolt be correspondingly arranged, can be used for push-plate 241 and institute described in second vibration isolator 24 by the quantity
The synergistic effect for stating electromagnet 242 limits the equipment to be damped in the vibration equipment to be damped, to avoid institute
Equipment to be damped is stated to walk about phenomenon.
Such as：Can by four " it is recessed " shape electromagnet and push-plate (such as：Push-plate 241) cooperation jointly, it generates limit and makees
With the probability of the damage of reduction washing machine lower margin and the generation of " walking about " phenomenon.
Such as：Buoyant raft vibration isolation is carried out by using pedestal, vibration can be reduced, reduces lower margin damage, can also reduce " to walk
It is dynamic " probability that occurs of phenomenon, it is common because horizontal vibration power is more than lower margin frictional force " walking about " for generating such as to reduce washing machine
The probability that phenomenon occurs.
It, can be to be damped as a result, by the electromagnetism vibration isolator of each foundation bolt setting corresponding to equipment to be damped
Each of equipment ground strength of one's legs carries out vibration damping, to realize the position-limiting action for treating dampening apparatus, avoids the equipment to be damped
It walks about phenomenon, is conducive to improve effect of vibration and noise reduction, also helps and promote equipment reliability of operation to be damped.
In an optional example, the quantity of first vibration isolator 22 is more than one.
As a result, by more than one first vibration isolator, vibration isolation can be carried out by the first vibration isolator of different number, if
It is good to set flexibility, vibration isolating effect is good.
In an optional example, the quantity of second vibration isolator 24 is more than one.
As a result, by more than one second vibration isolator, vibration isolation can be carried out by the second vibration isolator of different number, every
Mode of shaking is flexible, versatile.
In an optional example, when the vibration absorber is placed vertically, if the spring-damper 221 is positioned at upper
When layer, then the electromagnetism vibration isolator is located at lower layer.If the spring-damper 221 is located at lower layer, the electromagnetism vibration isolator
Positioned at upper layer.
Such as：Based on the principle of buoyant raft vibration isolation, have been demonstrated there is better vibration damping under each vibration frequency and rigidity
Effect, while lower layer's vibration isolator is using active damping mode as electromagnetism vibration isolation, on the one hand, by the effect in magnetic field to avoid
The hard contact of component；On the other hand, it is monitored in real time using displacement sensor, feedback signal is strong by controller regulation and control magnetic field
Degree increases dissipation of the vibrational energy on pedestal, can efficiently control the size of vibration, washing machine is made more smoothly to transport
Row, while reducing the noise of operation.
Such as：In the utility model washing machine pedestal (such as：Pedestal 2), it can be with as shown in Fig. 2, upper layer vibration isolator (example
Such as：Second vibration isolator 22) the common spring-damper of use (such as：Spring-damper 221), correspondence washing machine (such as：Laundry
Machine 1) four ground placement of foot are arranged four, and be fixed on intermediate raft body tablet (such as：Raft body 23) on, lower layer's vibration isolator (example
Such as：Second vibration isolator 24) using electromagnetism vibration isolation form (such as：Electromagnetism vibration isolator).
As a result, by the different modes of emplacement of vibration absorber, in conjunction with the different settings of spring-damper and electromagnetism vibration isolator
Position can be adapted for a variety of equipment to be damped and a variety of occasions, and the flexibility and convenience used is able to significant increase.
In an optional embodiment, can also include：At least one of apparatus connecting unit 21 and pedestal 25.
In an optional example, the apparatus connecting unit 21 is set to first vibration isolator 22 far from the raft body
23 side can be used for contact or connection between first vibration isolator 22 and the equipment to be damped.
As a result, by apparatus connecting unit, the setting between the first vibration isolator and equipment to be damped can be facilitated, be conducive to carry
The fastness being arranged between equipment to be damped and the first vibration isolator is risen, further to promote effect of vibration and noise reduction.
Optionally, the apparatus connecting unit 21 may include：In integral type interconnecting piece, split type interconnecting piece at least it
One.When the apparatus connecting unit 21 may include split type interconnecting piece, the quantity of the split type interconnecting piece and described first
The quantity of vibration isolator 22 is consistent.
As a result, by the apparatus connecting unit of diversified forms, it can be promoted and be arranged between the first vibration isolator and equipment to be damped
Flexibility and diversity.
In an optional example, the pedestal 25 is set to one of second vibration isolator 24 far from the raft body 23
Side can be used for contact or connection between second vibration isolator 24 and the matrix in the equipment local environment to be damped.
Wherein, described matrix may include：Ground, wall and other fixed structures (such as：It desk and is placed on
Other equipment etc. for needing vibrationproof) in any one.
As a result, by pedestal, the setting between matrix in the second vibration isolator and equipment local environment to be damped can be facilitated,
Be conducive to be promoted the stability installed between the second vibration isolator or even vibration absorber, equipment to be damped and safety, and then can be with
Promote the effect of vibration and noise reduction of vibration absorber and equipment reliability of operation to be damped.
Optionally, the pedestal 25 may include：At least one of integral type pedestal, Separated base.When the base
When seat 25 may include Separated base, the quantity of the Separated base is consistent with the quantity of second vibration isolator 24.
As a result, by the pedestal of diversified forms, the second vibration isolator and matrix in equipment local environment to be damped can be promoted
Between the flexibility that is arranged and diversity, also help the functional reliability and safety for promoting vibration absorber and equipment to be damped
Property.
In an optional example, the apparatus connecting unit 21, first vibration isolator 22, the raft body 23, described
The thickness or height of at least one of two vibration isolators 24, the pedestal 25, can be adjusted according to use demand.
Such as：Washing machine height is improved, life convenient is increased.
Such as：By increasing the height of washing machine, clothing of conveniently taking, while common washing can be placed in pedestal and is used
Tool improves the convenience that life uses.Such as：Due to being provided with pedestal, the height of washing machine is suitably increased, clothing of conveniently taking
Object so that user is more convenient to use；Further, article can also be placed in pedestal, such as places washing implement, to
Further promote the convenience that user uses.
As a result, by according to use demand in apparatus connecting unit, the first vibration isolator, raft body, the second vibration isolator, pedestal appoint
The thickness or height of meaning one or several are adjusted, and user can be made more convenient to use, to further promote user experience.
In an optional embodiment, can also include：Displacement sensor 27 and controller 26.
Wherein, institute's displacement sensors 27 can be used for obtaining the vibration displacement of the electromagnetism vibration isolator.The controller
26, it can be used for, in the case where the vibration displacement is greater than or equal to setting displacement, turning the input of the electromagnetism vibration isolator down
Electric current.In the case where the vibration displacement is less than the setting displacement, the input current of the electromagnetism vibration isolator is tuned up.
Such as：The mechanical model of entire pedestal can with as shown in figure 3, upper layer vibration isolator (such as：Second vibration isolator 22) it adopts
With passive type vibration damping, spring-damper (such as：Spring-damper 221) stiffness K1、 K2Deng and damping C1、C2Etc. being normal
Amount；Lower layer's damper (such as：Second vibration isolator 24) use active vibration damping.
Wherein, the operation principle of lower layer's damper (i.e. lower layer's vibration isolator) can be with as shown in figure 4, using displacement sensor
(such as：Displacement sensor 27) be distributed in push-plate (such as：Push-plate 241) on real-time monitoring vibration displacement.Such as：When vibration is transmitted
To push-plate (such as：Push-plate 241) when, by displacement sensor (such as：Displacement sensor 27) monitoring push-plate (such as：Push-plate
241) vibration displacement, and by the vibration displacement signal monitored by comparing device (such as：Comparator 28) after feed back to control
In device；Controller (such as：Controller 26) according to the size of vibration displacement signals-modulating electric current to change magnetic field intensity, so as to
With change each electromagnetism vibration isolator (such as：Second vibration isolator 24) equivalent stiffness Km1With equivalent damping Cm1, weaken vibration, make
Washing machine is run more stablely.
Be arranged as a result, by the adaptation of displacement sensor and controller, can to the magnetic field force size of electromagnetism vibration isolator into
Row control, with according to Vibration Condition regulate and control electromagnetism vibration isolator input current, so as to more precisely, more stably carry out vibration damping
Noise reduction process.
In an optional example, when the electromagnetism vibration isolator may include push-plate 241 and electromagnet 242, institute's rheme
Displacement sensor 27 is distributed on the push-plate 241.The input current of the electromagnetism vibration isolator is defeated to the electromagnet 242
Enter and can be used for generating the electric current of electromagnetic force.
As a result, by the way that displacement sensor to be distributed on push-plate, can be promoted vibration displacement acquisition accuracy and in time
Property, to be conducive to promote the accuracy controlled electromagnetism vibration isolator input current and stability.
In an optional example, when the quantity of the electromagnetism vibration isolator is more than one, institute's displacement sensors 27
Quantity it is consistent with the quantity of electromagnetism vibration isolator.
Wherein, each institute's displacement sensors 27 can be used for obtaining each of each described electromagnetism vibration isolator vibration position
It moves.Control of the controller 26 to the input current of the electromagnetism vibration isolator may include：According to each vibration position
It moves, the corresponding input current of each electromagnetism vibration isolator is individually controlled.
Such as：Four electromagnetism vibration isolators can separately be controlled, vibration not of uniform size with coping with washing machine strength of one's legs
Different situations.
As a result, by individually being controlled each electromagnetism vibration isolator, it can be promoted and treat the control of dampening apparatus vibration damping
Accuracy and stability.
In an optional embodiment, can also include：Comparator 28.
Wherein, the comparator 28 can be used for being compared the vibration displacement and the setting displacement, with determination
The magnitude relationship of the vibration displacement and the setting displacement.
Vibration displacement and setting displacement are compared by comparing device as a result, processing mode is easy, and handling result is reliable
Property it is high.
It, can by making pedestal use buoyant raft vibration isolation way using the technical solution of the present embodiment through a large amount of verification experimental verification
To reduce the noise generated when the vibration and operation earthward transmitted during use, so as to be effectively reduced vibration to ground
The noise generated when the transmission and operation in face.
Embodiment according to the present utility model additionally provides a kind of washing machine corresponding to vibration absorber.It is shown in Figure 2
The assembling structure schematic diagram of the vibration absorber of the utility model and an embodiment of washing machine.The washing machine may include：More than
The vibration absorber；The vibration absorber is installed on the bottom of the washing machine 2, the pedestal 1 as the washing machine 2.
Wherein, when the quantity of second vibration isolator 24 is four, four second vibration isolators 24, with the laundry
Four foundation bolts of motor spindle are correspondingly arranged.
In an optional embodiment, principle of the utility model based on buoyant raft vibration isolation, in each vibration frequency and just
There is good effectiveness in vibration suppression under degree, while using passively arranging in pairs or groups in a buoyant raft vibration insulating system with active damping mode, it can
Differed with adapting to washing machine strength of one's legs and the Vibration Condition under different rotating speeds, reaches good effect of vibration and noise reduction；Together
When, the probability of the damage of washing machine lower margin and the generation of " walking about " phenomenon is reduced, washing machine height is improved, increases life convenient.
Such as：Principle of the utility model based on buoyant raft vibration isolation has been demonstrated have under each vibration frequency and rigidity
Better effectiveness in vibration suppression, while lower layer's vibration isolator is using active damping mode as electromagnetism vibration isolation, on the one hand, pass through magnetic field
Act on the hard contact to avoid component；On the other hand, it is monitored in real time using displacement sensor, feedback signal passes through controller tune
Magnetic field intensity is controlled, increases dissipation of the vibrational energy on pedestal, the size of vibration can be efficiently controlled, keeps washing machine more flat
It quietly runs, while reducing the noise of operation.
Wherein, the utility model be based on buoyant raft vibration isolation, common buoyant raft shock-resistant system by upper layer vibration isolator (such as：Upper layer
Vibration isolator 12), intermediate raft body (such as：First raft body 13) and lower layer's vibration isolator (such as：Lower layer's vibration isolator 14) composition, mechanics
Model is as shown in Figure 1.Because the upper layer vibration isolator of the buoyant raft shock-resistant system can accept different vibration sources, had between vibration source certain
Negative function, thus have better effect compared to single-layer partiting polarization and double-layer vibration isolating.
Such as：Upper layer vibration isolator 12 can be set between top apparatus interconnecting piece 11 and intermediate raft body 13；Lower layer's vibration isolation
Device 14 can be set between intermediate raft body 13 and bottom base 15.
In an optional example, washing machine pedestal in the utility model (such as：Pedestal 2, i.e. vibration absorber), it can be with
As shown in Fig. 2, upper layer vibration isolator (such as：Second vibration isolator 22) the common spring-damper of use (such as：Spring-damper
221), corresponding washing machine (such as：Washing machine 1) four ground placement of foot are arranged four, and are fixed on intermediate raft body tablet (example
Such as：Raft body 23) on, lower layer's vibration isolator (such as：Second vibration isolator 24) using electromagnetism vibration isolation form (such as：Electromagnetism vibration isolator).
Optionally, electromagnetism vibration isolation form, may be used push-plate (such as：Push-plate 241) and electromagnet (such as：Electromagnet
242) it realizes.Wherein, push-plate (such as：Push-plate 241) and raft body tablet (such as：Raft body 23) it is affixed, it is placed in " recessed " shape electromagnetism
In the field region that iron generates, the magnetic field force of generation is vertical direction, " recessed " shape electromagnet and pedestal (such as：Pedestal 25) it is solid
It connects.More it is alternatively possible to by four " it is recessed " shape electromagnet and push-plate (such as：Push-plate 241) cooperation jointly, it generates limit and makees
With.
Specifically, the mechanical model of entire pedestal can with as shown in figure 3, upper layer vibration isolator (such as：Second vibration isolator 22)
Using passive type vibration damping, spring-damper (such as：Spring-damper 221) stiffness K1、K2Deng and damping C1、C2Etc. being
Constant；Lower layer's damper (such as：Second vibration isolator 24) use active vibration damping.
Wherein, the operation principle of lower layer's damper (i.e. lower layer's vibration isolator) can be with as shown in figure 4, using displacement sensor
(such as：Displacement sensor 27) be distributed in push-plate (such as：Push-plate 241) on real-time monitoring vibration displacement.Such as：When vibration is transmitted
To push-plate (such as：Push-plate 241) when, by displacement sensor (such as：Displacement sensor 27) monitoring push-plate (such as：Push-plate
241) vibration displacement, and by the vibration displacement signal monitored by comparing device (such as：Comparator 28) after feed back to control
In device；Controller (such as：Controller 26) according to the size of vibration displacement signals-modulating electric current to change magnetic field intensity, so as to
With change each electromagnetism vibration isolator (such as：Second vibration isolator 24) equivalent stiffness Km1With equivalent damping Cm1, weaken vibration, make
Washing machine is run more stablely.Meanwhile four electromagnetism vibration isolators can separately be controlled, it is big with coping with washing machine strength of one's legs
It is small to differ, vibrate different situations.
Wherein, may include to change magnetic field intensity according to the size of vibration displacement signals-modulating electric current：Work as vibration displacement
When signal is greater than the set value, reduce electric current；Conversely, when vibration displacement signal is less than setting value, increase electric current.
In this way, by passively with active vibration damping arrange in pairs or groups in a semi-active type buoyant raft vibration insulating system (such as：By passive
Formula vibration-proof structure and active vibration damping structure matching form a semi-active type buoyant raft vibration insulating system) in, it can be in different frequency
There is good vibration isolation and damping effect under vibration, adapts to Vibration Condition of the washing machine under different rotating speeds, reach good vibration damping
Noise reduction.
To sum up, the technical solution of the utility model, the advantageous effect that can at least reach may include：
1) it is vibrated when being directed to washing machine operation, ground has obvious vibration sense, while noise is also larger, and influencing user makes
The problems such as with experience and neighborhood relationship.In the utility model, pedestal (i.e. vibration absorber) uses buoyant raft vibration isolation way, it is possible to reduce
The noise generated when the vibration and operation earthward transmitted during use, so as to be effectively reduced the biography of vibration earthward
The noise passed and generated when running.
Wherein, buoyant raft is a kind of vibration insulation and noise reduction device being applied on naval vessel, is a kind of special vibrating isolation system, mechanism
It is to make shaking for naval vessel watchcase using the damping and intermediate mass of buoyant raft device elastic element come the vibrational energy that controls and decay
It is dynamic to reduce.
It 2), can instead of the rigid contact on traditional ground and lower margin by the effect in magnetic field in pedestal in the utility model
To reduce the lower margin damage that rigid contact is brought, such as reduces traditional ground and damaged with the lower margin that lower margin rigid contact is brought.
3) in the utility model, buoyant raft vibration isolation is carried out by using pedestal, vibration can be reduced, reduce lower margin damage, also
The probability that the generation of " walking about " phenomenon can be reduced, as reduced, washing machine is common to be produced because horizontal vibration power is more than lower margin frictional force
The probability that raw " walking about " phenomenon occurs.
4) it in the utility model, by increasing the height of washing machine, clothing of conveniently taking, while can be placed in pedestal often
With washing implement, the convenience that life uses is improved.Such as：Due to being provided with pedestal, the height of washing machine is suitably increased, side
Just it takes clothing so that user is more convenient to use；Further, article can also be placed in pedestal, such as placed washing and used
Tool etc., to further promote the convenience that user uses.
The processing and function realized by the device of the present embodiment essentially correspond to earlier figures 2 and method shown in Fig. 3
Embodiment, principle and example, therefore not detailed place in the description of the present embodiment may refer to mutually speaking on somebody's behalf in previous embodiment
Bright, this will not be repeated here.
Through a large amount of verification experimental verification, can be subtracted by the effect in magnetic field in pedestal using the technical solution of the utility model
The lower margin damage that small rigid contact is brought such as reduces traditional ground and is damaged with the lower margin that lower margin rigid contact is brought.
Embodiment according to the present utility model additionally provides a kind of oscillation damping method of washing machine corresponding to washing machine.It should
The oscillation damping method of washing machine may include：
Step S110, by the spring-damper 221, the vibration generated when being run to the washing machine carries out passive type
Vibration damping processing.
Step S120, by the electromagnetism vibration isolator, active vibration damping processing is carried out to the vibration.
Such as：Based on the principle of buoyant raft vibration isolation, there is good effectiveness in vibration suppression under each vibration frequency and rigidity, simultaneously
Using passively arranging in pairs or groups in a buoyant raft vibration insulating system with active damping mode, with being adapted to washing machine strength of one's legs differ and
Vibration Condition under different rotating speeds reaches good effect of vibration and noise reduction.
Such as：By passively with active vibration damping arrange in pairs or groups in a semi-active type buoyant raft vibration insulating system (such as：By passive
Formula vibration-proof structure and active vibration damping structure matching form a semi-active type buoyant raft vibration insulating system) in, it can be in different frequency
There is good vibration isolation and damping effect under vibration, adapts to Vibration Condition of the washing machine under different rotating speeds, reach good vibration damping
Noise reduction.
Such as：Pedestal (i.e. vibration absorber) uses buoyant raft vibration isolation way, it is possible to reduce is earthward transmitted during use
The noise that generates when vibration and operation, so as to be effectively reduced making an uproar of being generated when the transmission and operation of vibration earthward
Sound.
Passive type and active vibration damping in combination are carried out by spring-damper and electromagnetism vibration isolator as a result, are adapted to
The ground strength of one's legs of equipment to be damped differ and different rotating speeds etc. it is a variety of in the case of Vibration Condition, reach good vibration and noise reducing
Effect, and reliability is high, the comfort and convenience that user uses are good.
In an optional example, active vibration damping processing is carried out to the vibration in step S120, may include：Work as institute
It states vibration absorber to include pedestal 25 and the electromagnetism vibration isolator when may include push-plate 241 and electromagnet 242, in institute
When stating push-plate 241 with the vibration equipment to be damped, the magnetic fields of the magnetic field force are generated by the electromagnet 242, are kept away
Exempt from the rigid contact between the push-plate 241 and the pedestal 25.
Such as：Push-plate (such as：Push-plate 241) and raft body tablet (such as：Raft body 23) it is affixed, it is placed in " recessed " shape electromagnet
In the field region of generation, the magnetic field force of generation is vertical direction, " recessed " shape electromagnet and pedestal (such as：Pedestal 25) it is affixed.
Such as：It can reduce rigidity instead of the rigid contact on traditional ground and lower margin by the effect in magnetic field in pedestal
The lower margin damage brought is contacted, such as reduces traditional ground and is damaged with the lower margin that lower margin rigid contact is brought.
Being equipped with by push-plate and electromagnet as a result, may be implemented electromagnetism vibration isolation, simple in structure, control mode letter
Just, and reliability is high.
In an optional example, when corresponding foundation bolt is corresponding to the washing machine sets for four electromagnetism vibration isolators
When setting, by the synergistic effect of push-plate 241 and electromagnet 242 in four electromagnetism vibration isolators, in the washing machine
The washing machine is limited, is walked about phenomenon to avoid the washing machine.
Such as：Can by four " it is recessed " shape electromagnet and push-plate (such as：Push-plate 241) cooperation jointly, it generates limit and makees
With the probability of the damage of reduction washing machine lower margin and the generation of " walking about " phenomenon.
Such as：Buoyant raft vibration isolation is carried out by using pedestal, vibration can be reduced, reduces lower margin damage, can also reduce " to walk
It is dynamic " probability that occurs of phenomenon, it is common because horizontal vibration power is more than lower margin frictional force " walking about " for generating such as to reduce washing machine
The probability that phenomenon occurs.
It, can be to be damped as a result, by the electromagnetism vibration isolator of each foundation bolt setting corresponding to equipment to be damped
Each of equipment ground strength of one's legs carries out vibration damping, to realize the position-limiting action for treating dampening apparatus, avoids the equipment to be damped
It walks about phenomenon, is conducive to improve effect of vibration and noise reduction, also helps and promote equipment reliability of operation to be damped.
In an optional embodiment, can also include：The size of the electromagnetic force of electromagnetism vibration isolator is controlled
Process.
Specifically, the process controlled the size of the electromagnetic force of electromagnetism vibration isolator may include：
Step S210, the vibration displacement of the electromagnetism vibration isolator is obtained.
Step S220, in the case where the vibration displacement is greater than or equal to setting displacement, the electromagnetism vibration isolator is turned down
Input current；In the case where the vibration displacement is less than the setting displacement, the input electricity of the electromagnetism vibration isolator is tuned up
Stream.
Such as：The mechanical model of entire pedestal can with as shown in figure 3, upper layer vibration isolator (such as：Second vibration isolator 22) it adopts
With passive type vibration damping, spring-damper (such as：Spring-damper 221) stiffness K1、 K2Deng and damping C1、C2Etc. being normal
Amount；Lower layer's damper (such as：Second vibration isolator 24) use active vibration damping.
Wherein, the operation principle of lower layer's damper (i.e. lower layer's vibration isolator) can be with as shown in figure 4, using displacement sensor
(such as：Displacement sensor 27) be distributed in push-plate (such as：Push-plate 241) on real-time monitoring vibration displacement.Such as：When vibration is transmitted
To push-plate (such as：Push-plate 241) when, by displacement sensor (such as：Displacement sensor 27) monitoring push-plate (such as：Push-plate
241) vibration displacement, and by the vibration displacement signal monitored by comparing device (such as：Comparator 28) after feed back to control
In device；Controller (such as：Controller 26) according to the size of vibration displacement signals-modulating electric current to change magnetic field intensity, so as to
With change each electromagnetism vibration isolator (such as：Second vibration isolator 24) equivalent stiffness Km1With equivalent damping Cm1, weaken vibration, make
Washing machine is run more stablely.
Be arranged as a result, by the adaptation of displacement sensor and controller, can to the magnetic field force size of electromagnetism vibration isolator into
Row control, with according to Vibration Condition regulate and control electromagnetism vibration isolator input current, so as to more precisely, more stably carry out vibration damping
Noise reduction process.
In an optional example, when the quantity of the electromagnetism vibration isolator is more than one, institute is obtained in step S210
The vibration displacement for stating electromagnetism vibration isolator may include：Obtain each vibration displacement of each electromagnetism vibration isolator.Step S220
In control to the input current of the electromagnetism vibration isolator, may include：According to each vibration displacement, to each electricity
The corresponding input current of magnetic vibration isolator is individually controlled.
Such as：Four electromagnetism vibration isolators can separately be controlled, vibration not of uniform size with coping with washing machine strength of one's legs
Different situations.
As a result, by individually being controlled each electromagnetism vibration isolator, it can be promoted and treat the control of dampening apparatus vibration damping
Accuracy and stability.
In an optional embodiment, the process that the size based on the electromagnetic force to electromagnetism vibration isolator is controlled, also
May include：The process that vibration displacement and setting displacement are compared.
Specifically, to vibration displacement and the process that is compared of setting displacement, may include：To the vibration displacement and institute
It states setting displacement to be compared, with the magnitude relationship of the determination vibration displacement and the setting displacement.
Vibration displacement and setting displacement are compared by comparing device as a result, processing mode is easy, and handling result is reliable
Property it is high.
The processing and function realized by the oscillation damping method of the washing machine of the present embodiment essentially correspond to aforementioned washing machine
Embodiment, principle and example, therefore not detailed place in the description of the present embodiment may refer to mutually speaking on somebody's behalf in previous embodiment
Bright, this will not be repeated here.
Through a large amount of verification experimental verification, using the technical solution of the utility model, buoyant raft vibration isolation is carried out by using pedestal, it can
To reduce vibration, reduce lower margin damage, the probability of " walking about " phenomenon generation can also be reduced, it is common because of water such as to reduce washing machine
Flat vibration force generates the probability of " walking about " phenomenon generation more than lower margin frictional force.
To sum up, it will be readily appreciated by those skilled in the art that under the premise of not conflicting, above-mentioned each advantageous manner can be certainly
It combined, be superimposed by ground.
The above description is only the embodiments of the present invention, is not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the right of the utility model.
Claims (10)
1. a kind of vibration absorber, which is characterized in that including：First vibration isolator (22), raft body (23) and the second vibration isolator (24)；Institute
The first vibration isolator (22) and second vibration isolator (24) are stated, the both sides of the raft body (23) are respectively arranged at；Wherein,
One in first vibration isolator (22) and second vibration isolator (24), including：Spring-damper (221)；It is described
Spring-damper (221) carries out passive type vibration damping processing for treating the vibration generated when dampening apparatus operation；
Another in first vibration isolator (22) and second vibration isolator (24), including：Electromagnetism vibration isolator；The electromagnetism
Vibration isolator, for carrying out active vibration damping processing to the vibration.
2. the apparatus according to claim 1, which is characterized in that wherein,
The quantity of first vibration isolator (22) is more than one；And/or
The quantity of second vibration isolator (24) is more than one；
And/or
When the vibration absorber is placed vertically, if the spring-damper (221) is located at upper layer, the electromagnetism vibration isolator
Positioned at lower layer；If the spring-damper (221) is located at lower layer, the electromagnetism vibration isolator is located at upper layer.
3. the apparatus according to claim 1, which is characterized in that further include；In apparatus connecting unit (21) and pedestal (25)
At least one；Wherein,
The apparatus connecting unit (21) is set to side of first vibration isolator (22) far from the raft body (23), is used for institute
State the contact or connection between the first vibration isolator (22) and the equipment to be damped；
The pedestal (25) is set to side of second vibration isolator (24) far from the raft body (23), is used for described second
Contact or connection between vibration isolator (24) and the matrix in the equipment local environment to be damped；Wherein, described matrix, packet
It includes：Any one in ground, wall.
4. device according to claim 3, which is characterized in that wherein,
The apparatus connecting unit (21), including：At least one of integral type interconnecting piece, split type interconnecting piece；When the equipment
When interconnecting piece (21) includes split type interconnecting piece, the quantity of the quantity of the split type interconnecting piece and first vibration isolator (22)
Unanimously；
And/or
The raft body (23), including：At least one of integral type raft body, split type raft body；When the raft body (23) includes point
When body formula raft body, the quantity of the split type raft body meets while first vibration isolator (22) and second vibration isolation is arranged
Requirement when device (24)；
And/or
The pedestal (25), including：At least one of integral type pedestal, Separated base；When the pedestal (25) includes point
When body type base, the quantity of the Separated base is consistent with the quantity of the second vibration isolator (24)；
And/or
The apparatus connecting unit (21), first vibration isolator (22), the raft body (23), second vibration isolator (24), institute
The thickness or height for stating at least one of pedestal (25), can be adjusted according to use demand.
5. according to the device described in one of claim 1-4, which is characterized in that the electromagnetism vibration isolator, including：Push-plate (241)
With electromagnet (242)；Wherein,
One end of the push-plate (241) is installed on the raft body (23)；The other end of the push-plate (241), is placed in the electricity
In the field region that magnetic field force produced by magnet (242) is formed；
When the vibration absorber further includes pedestal (25), the electromagnet (242) is installed on the pedestal (25), for producing
The raw magnetic field force, when the push-plate (241) is with the vibration equipment to be damped, to be made by the magnetic field of the magnetic field force
With avoiding the rigid contact between the push-plate (241) and the pedestal (25).
6. device according to claim 5, which is characterized in that wherein,
The structure of the push-plate (241), including：First connector, intermediate connector and the second connector；Wherein,
First connector is connected to the raft body (23)；
Second connector is placed in the field region of the electromagnet (242)；
The intermediate connector is connected between first connector and second connector, and is connect with described first
Part and second connector form zigzag configuration；
And/or
The structure of the electromagnet (242), including：In concave structure, half I-shape construction, arcuate structure, C-shaped configuration at least
One of；
And/or
The direction for the magnetic field force that the electromagnet (242) generates, perpendicular to plane where the raft body (23).
7. device according to claim 6, which is characterized in that wherein,
In the zigzag configuration,
First connector and second connector are arranged in parallel, and the intermediate connector is perpendicular to first connector
It is arranged with second connector；
And/or
When second vibration isolator (24) include electromagnetism vibration isolator and second vibration isolator (24) quantity with it is described to be damped
When the quantity of the foundation bolt of equipment is identical, each second vibration isolator (24), to the corresponding lower margin of the equipment to be damped
Bolt is correspondingly arranged, for push-plate (241) and the electromagnet described in second vibration isolator (24) by the quantity
(242) synergistic effect limits the equipment to be damped in the vibration equipment to be damped.
8. according to the device described in one of claim 1-4, which is characterized in that further include：Displacement sensor (27) and controller
(26)；Wherein,
Institute's displacement sensors (27), the vibration displacement for obtaining the electromagnetism vibration isolator；
The controller (26), in the case where the vibration displacement is greater than or equal to setting displacement, turning the electromagnetism down
The input current of vibration isolator；In the case where the vibration displacement is less than the setting displacement, the electromagnetism vibration isolator is tuned up
Input current.
9. device according to claim 8, which is characterized in that wherein,
Further include：Comparator (28)；
The comparator (28), for being compared to the vibration displacement and the setting displacement, with the determination vibration position
Move the magnitude relationship with the setting displacement；
And/or
When the electromagnetism vibration isolator includes push-plate (241) and electromagnet (242),
Institute's displacement sensors (27) are distributed on the push-plate (241)；
The input current of the electromagnetism vibration isolator, to input to the electromagnet (242) and being used to generate the electric current of electromagnetic force；
And/or
When the quantity of the electromagnetism vibration isolator is more than one,
The quantity of institute's displacement sensors (27) is consistent with the quantity of electromagnetism vibration isolator；Wherein,
Each institute's displacement sensors (27), each vibration displacement for obtaining each electromagnetism vibration isolator；
Control of the controller (26) to the input current of the electromagnetism vibration isolator, including：According to each vibration displacement,
The corresponding input current of each electromagnetism vibration isolator is individually controlled.
10. a kind of washing machine, which is characterized in that including：Vibration absorber as claimed in any one of claims 1-9 wherein；
The vibration absorber is installed on the bottom of the washing machine (2), the pedestal (1) as the washing machine (2)；
Wherein, when the quantity of second vibration isolator (24) is four, four second vibration isolators (24), with the laundry
Four foundation bolts of motor spindle are correspondingly arranged.
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| CN107881707A (en) * | 2017-11-03 | 2018-04-06 | 珠海格力电器股份有限公司 | A kind of vibration absorber, washing machine and its oscillation damping method |
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